Aspen Plus is a leading process simulation software used in various industries for engineering design and optimization.
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Best OLI Studio Alternatives ranked by AI · updated Aug 2026
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OLI Studio is chemical-process simulation software focused on aqueous chemistry, electrolytes, corrosion, and scale prediction. It is used by chemical engineers and process industries to model difficult water and electrolyte systems.
Top 6 OLI Studio alternatives
HSC Chemistry is thermochemical process modeling software for metallurgists, chemical engineers, and researchers. It provides equilibrium calculations, reaction thermochemistry, mineral processing tools,...
Pros
- Strong coverage of metallurgical thermochemistry and mineral processing
- Includes equilibrium, kinetics, electrochemical, and gas calculations in one suite
- Flowsheet tools are more specialized for process metallurgy than general chemical simulators
Cons
- Commercial licensing is less transparent than open-source alternatives
- Interface and workflows are less modern than leading general-purpose simulators
- Less suitable than Aspen Plus for broad plant-wide process design
3
FactSage
Thermfact and GTT-Technologies
FactSage is thermochemical software for equilibrium calculations, phase diagrams, predominance diagrams, and process modeling. It is used by metallurgists, materials researchers, and...
Pros
- Broader thermodynamic database and phase-equilibrium tooling than HSC Chemistry
- Excellent for phase diagrams, slag-metal-gas equilibria, and materials research
- Supports extensive chemical-system and database customization
Cons
- Less integrated flowsheet functionality than HSC Chemistry
- Steeper learning curve for users focused on process simulation
- Commercial licensing and database access can be complex
4
Thermo-Calc
Thermo-Calc Software
Thermo-Calc is computational thermodynamics software for phase equilibria, phase diagrams, and materials-property prediction. It serves materials scientists, metallurgists, and engineers developing alloys,...
Pros
- Industry-standard tools for CALPHAD-based materials thermodynamics
- Strong phase-diagram, solidification, and property-modeling capabilities
- Large ecosystem of validated materials databases and add-ons
Cons
- Less focused on metallurgical process flowsheets than HSC Chemistry
- Can require additional modules or databases for specific applications
- More specialized toward materials development than general chemical processing
5
MTDATA
National Physical Laboratory
MTDATA is thermodynamic and phase-equilibrium software for metals, alloys, slags, and other multicomponent materials. It is aimed at researchers and engineers performing...
Pros
- Strong support for metallurgical systems, alloys, slags, and phase equilibria
- Useful for database-driven CALPHAD research and materials development
- Can provide more detailed materials thermodynamics than general process simulators
Cons
- Less convenient than HSC Chemistry for integrated process flowsheets
- Smaller user ecosystem and less broad process-engineering adoption
- Database and module availability varies by licensed configuration
6
OpenCalphad
OpenCalphad Community
OpenCalphad is open-source software for thermodynamic calculations based on CALPHAD databases. It is intended for researchers and developers who need phase-equilibrium and...
Pros
- Free and open-source, unlike HSC Chemistry and most commercial alternatives
- Supports equilibrium calculations using compatible CALPHAD databases
- Suitable for scripting, research workflows, and custom thermodynamic development
Cons
- Much less polished and integrated than HSC Chemistry
- Does not provide comparable built-in metallurgical utilities or flowsheet tools
- Database acquisition, setup, and validation require more technical effort
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